topic Re: Cannot expand snapdrive lun in Data Protection

Cannot expand snapdrive lun

PETERKLEIN — Wed, 04 Jun 2025 14:59:42 GMT

When I click the button "Expand Disk..." to expand the lun with SnapDrive GUI, I got following error:

Unable to reseize disk. Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

SnapDrive Version: 7.1.4

OS: Windows Server 2016

Volume for the LUN is 250GB large.

LUN details:

::> lun show -vserver xx -lun userdblog_L.lun -instance

Vserver Name: xx
LUN Path: /vol/xx__usrdblog_01/q_userdblog/userdblog_L.lun
Volume Name: xx__usrdblog_01
Qtree Name: q_userdblog
LUN Name: userdblog_L.lun
LUN Size: 150.0GB
OS Type: windows_2008
Space Reservation: enabled
Serial Number: ds/ea4q8-Ed8
Serial Number (Hex): 64732f65613471382d456438
Comment:
Space Reservations Honored: false
Space Allocation: disabled
State: online
LUN UUID: 55799008-8d97-4c84-b780-51ae83a5952c
Mapped: mapped
Block Size: 512
Device Legacy ID: -
Device Binary ID: -
Device Text ID: -
Read Only: false
Fenced Due to Restore: false
Used Size: 139.3GB
Maximum Resize Size: 1.47TB
Creation Time: 4/24/2015 16:16:46
Class: regular
Node Hosting the LUN: xx
QoS Policy Group: -
Caching Policy Name: -
Clone: true
Clone Autodelete Enabled: false
Inconsistent Import: false

Re: Cannot expand snapdrive lun

matte — Fri, 09 Jun 2017 11:24:07 GMT

Which type of LUN is that one?

Is this a dynamic disk?

Looks like a kind of comunication issue between the windows machine and the virtual environemtn (i guess this is an RDM lun). Did you already try to restart the SD service?

Re: Cannot expand snapdrive lun

skneo — Fri, 09 Jun 2017 16:06:30 GMT

Have you try to resize the lun direct on storage controller and than use windows disk management und expand the drive after refresh ?

Re: Cannot expand snapdrive lun

PETERKLEIN — Tue, 13 Jun 2017 10:15:01 GMT

Rebooting the Windows-Server solved the problem.

@skneo

From SnapDrive created LUN's should be never changed with other tools like OnCommand System Manager or windows disk management.

These LUN's have have a special disk geometry from SnapDrive.

Example: Resizing a Snapdrive-LUN with OnCommand System Manager create huge "busy" snapshots in a Snapmirror-Relationship, that cannot be deleted!

Re: Cannot expand snapdrive lun

skneo — Tue, 13 Jun 2017 10:48:03 GMT

Thanks for the hin but i've never heard of one special disk geometry from SnapDrive.

But my lun initial not created with snapdrive, that could be the rasion i have not seen any issues.